Crack defect quantification method and device based on magnetic flux leakage space integration

A space integration and defect technology, applied in the direction of material magnetic variables, etc., can solve the problems of crack magnetic flux leakage signal leakage and loss of effective signal, etc., and achieve the effect of high quantification efficiency, clear theoretical model, and simple calculation formula

Pending Publication Date: 2022-06-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the problems that may occur when the conventional magnetic flux leakage detection system directly samples the leakage magnetic field, such as the leakage of the crack magnetic flux leakage signal or the loss of effective signals.

Method used

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  • Crack defect quantification method and device based on magnetic flux leakage space integration
  • Crack defect quantification method and device based on magnetic flux leakage space integration
  • Crack defect quantification method and device based on magnetic flux leakage space integration

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Embodiment 1

[0042] figure 1 It is a flow chart of a crack defect quantification method based on magnetic flux leakage spatial integration according to an embodiment of the present invention.

[0043] like figure 1 As shown, the method includes but is not limited to the following steps:

[0044] In step S1, the magnetic field measurement sensor of the analog voltage output type is used to obtain the magnetic flux leakage signal of the crack defect under different lift-off values.

[0045] Specifically, in this embodiment, the magnetic field measurement sensor of the analog voltage output type is used to obtain the magnetic flux leakage signal of the crack defect under different lift-off values; Under the lift-off value, the magnetic leakage signal of crack defect is the horizontal component B of the leakage magnetic field x , where the horizontal direction is the magnetization direction of the measured material; the vertical direction is the direction perpendicular to the magnetization,...

Embodiment 2

[0070] figure 2 is a flowchart according to a second embodiment of the present invention.

[0071] like figure 2 As shown, the crack defect quantification method based on the spatial integration of magnetic flux leakage provided in this embodiment includes but is not limited to the following steps:

[0072] In step S11, a magnetic field measurement sensor of an analog voltage output type is used to obtain the magnetic flux leakage signal of the crack defect under different lift-off values.

[0073] Step S21, combined with the mileage sampling trigger signal, the analog integration circuit is controlled to perform integration operation on the magnetic flux leakage signal of the crack defect under different lift-off values.

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Abstract

The invention discloses a crack defect quantification method and device based on magnetic flux leakage space integration. The method comprises the following steps: converting crack defect magnetic flux leakage signals under different lift-off values into analog voltage signals; carrying out integral operation on the crack defect magnetic flux leakage analog signals under different lift-off values by combining a mileage sampling trigger signal; sampling the output of the integral operation to obtain a first magnetic flux leakage signal integral value corresponding to the first lift-off value and a second magnetic flux leakage signal integral value corresponding to the second lift-off value; constructing an iterative equation to obtain a half-width quantitative numerical solution of the crack defect; obtaining a depth quantitative analytic solution of the crack defect according to a leakage magnetic field integration method; and outputting a quantitative size result of the crack defect. According to the invention, problems which may occur when a conventional magnetic flux leakage detection system directly samples a leakage magnetic field, such as leakage of crack magnetic flux leakage signals or loss of effective magnetic flux leakage signals, can be avoided; the theoretical model is clear, the calculation speed is high, the calculation result is accurate, and the crack defect size quantification efficiency is high.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a crack defect quantification method and device based on magnetic flux leakage spatial integration. Background technique [0002] Ferromagnetic materials are widely used in industrial fields, including pipelines for oil and gas transportation, storage tank floors, etc. Magnetic flux leakage testing is one of the most commonly used non-destructive testing techniques for ferromagnetic materials. Through saturation magnetization of the test piece, the leakage magnetic field signal at the defect is collected, the detected magnetic flux leakage signal is analyzed and processed, and the defect is obtained through quantitative calculation. size information. In the process of defect detection and size quantification, the most important defect targets include metal loss-type defects and crack-type defects. Among them, finding an accurate and fast crack-type defect MFL de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 黄松岭龙跃彭丽莎赵伟温舒智黄紫靖
Owner TSINGHUA UNIV
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